I love these glasses, I live in florida and the humidity is very high, these glasses work as advertised, hot or cold, no sweating, no rings on the tables, very well insulated and ladies no dripping down our blouses!  I hate drinking out of the insulated Tervis Plastic Tumblers.  I would and do recommed them to friends and may purchase them as Christmas gifts to my family members and friends.  

Pros: Better than a Tervis Tumbler by far, no plastic in this house!!!
Cons: None that I have found, I have been using these glasses for about 3 1/2 years